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<?php
declare(strict_types=1);
namespace Sabre\DAV\PropertyStorage\Backend;
use Sabre\DAV\PropFind;
use Sabre\DAV\PropPatch;
use Sabre\DAV\Xml\Property\Complex;
/**
* PropertyStorage PDO backend.
*
* This backend class uses a PDO-enabled database to store webdav properties.
* Both sqlite and mysql have been tested.
*
* The database structure can be found in the examples/sql/ directory.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class PDO implements BackendInterface
{
/**
* Value is stored as string.
*/
const VT_STRING = 1;
/**
* Value is stored as XML fragment.
*/
const VT_XML = 2;
/**
* Value is stored as a property object.
*/
const VT_OBJECT = 3;
/**
* PDO.
*
* @var \PDO
*/
protected $pdo;
/**
* PDO table name we'll be using.
*
* @var string
*/
public $tableName = 'propertystorage';
/**
* Creates the PDO property storage engine.
*
* @param \PDO $pdo
*/
public function __construct(\PDO $pdo)
{
$this->pdo = $pdo;
}
/**
* Fetches properties for a path.
*
* This method received a PropFind object, which contains all the
* information about the properties that need to be fetched.
*
* Usually you would just want to call 'get404Properties' on this object,
* as this will give you the _exact_ list of properties that need to be
* fetched, and haven't yet.
*
* However, you can also support the 'allprops' property here. In that
* case, you should check for $propFind->isAllProps().
*
* @param string $path
* @param PropFind $propFind
*/
public function propFind($path, PropFind $propFind)
{
if (!$propFind->isAllProps() && 0 === count($propFind->get404Properties())) {
return;
}
$query = 'SELECT name, value, valuetype FROM '.$this->tableName.' WHERE path = ?';
$stmt = $this->pdo->prepare($query);
$stmt->execute([$path]);
while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
if ('resource' === gettype($row['value'])) {
$row['value'] = stream_get_contents($row['value']);
}
switch ($row['valuetype']) {
case null:
case self::VT_STRING:
$propFind->set($row['name'], $row['value']);
break;
case self::VT_XML:
$propFind->set($row['name'], new Complex($row['value']));
break;
case self::VT_OBJECT:
$propFind->set($row['name'], unserialize($row['value']));
break;
}
}
}
/**
* Updates properties for a path.
*
* This method received a PropPatch object, which contains all the
* information about the update.
*
* Usually you would want to call 'handleRemaining' on this object, to get;
* a list of all properties that need to be stored.
*
* @param string $path
* @param PropPatch $propPatch
*/
public function propPatch($path, PropPatch $propPatch)
{
$propPatch->handleRemaining(function ($properties) use ($path) {
if ('pgsql' === $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME)) {
$updateSql = <<<SQL
INSERT INTO {$this->tableName} (path, name, valuetype, value)
VALUES (:path, :name, :valuetype, :value)
ON CONFLICT (path, name)
DO UPDATE SET valuetype = :valuetype, value = :value
SQL;
} else {
$updateSql = <<<SQL
REPLACE INTO {$this->tableName} (path, name, valuetype, value)
VALUES (:path, :name, :valuetype, :value)
SQL;
}
$updateStmt = $this->pdo->prepare($updateSql);
$deleteStmt = $this->pdo->prepare('DELETE FROM '.$this->tableName.' WHERE path = ? AND name = ?');
foreach ($properties as $name => $value) {
if (!is_null($value)) {
if (is_scalar($value)) {
$valueType = self::VT_STRING;
} elseif ($value instanceof Complex) {
$valueType = self::VT_XML;
$value = $value->getXml();
} else {
$valueType = self::VT_OBJECT;
$value = serialize($value);
}
$updateStmt->bindParam('path', $path, \PDO::PARAM_STR);
$updateStmt->bindParam('name', $name, \PDO::PARAM_STR);
$updateStmt->bindParam('valuetype', $valueType, \PDO::PARAM_INT);
$updateStmt->bindParam('value', $value, \PDO::PARAM_LOB);
$updateStmt->execute();
} else {
$deleteStmt->execute([$path, $name]);
}
}
return true;
});
}
/**
* This method is called after a node is deleted.
*
* This allows a backend to clean up all associated properties.
*
* The delete method will get called once for the deletion of an entire
* tree.
*
* @param string $path
*/
public function delete($path)
{
$stmt = $this->pdo->prepare('DELETE FROM '.$this->tableName." WHERE path = ? OR path LIKE ? ESCAPE '='");
$childPath = strtr(
$path,
[
'=' => '==',
'%' => '=%',
'_' => '=_',
]
).'/%';
$stmt->execute([$path, $childPath]);
}
/**
* This method is called after a successful MOVE.
*
* This should be used to migrate all properties from one path to another.
* Note that entire collections may be moved, so ensure that all properties
* for children are also moved along.
*
* @param string $source
* @param string $destination
*/
public function move($source, $destination)
{
// I don't know a way to write this all in a single sql query that's
// also compatible across db engines, so we're letting PHP do all the
// updates. Much slower, but it should still be pretty fast in most
// cases.
$select = $this->pdo->prepare('SELECT id, path FROM '.$this->tableName.' WHERE path = ? OR path LIKE ?');
$select->execute([$source, $source.'/%']);
$update = $this->pdo->prepare('UPDATE '.$this->tableName.' SET path = ? WHERE id = ?');
while ($row = $select->fetch(\PDO::FETCH_ASSOC)) {
// Sanity check. SQL may select too many records, such as records
// with different cases.
if ($row['path'] !== $source && 0 !== strpos($row['path'], $source.'/')) {
continue;
}
$trailingPart = substr($row['path'], strlen($source) + 1);
$newPath = $destination;
if ($trailingPart) {
$newPath .= '/'.$trailingPart;
}
$update->execute([$newPath, $row['id']]);
}
}
}
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